Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Electrical & Electronics Expert

1) describe the data needed for estimating the regulation of alternator by the potier method. Describe how regulation is determined for different power factor.

2) Determine the synchronous impedance and reactance of an alternator where the given field current generates an armature current of 200 A on short circuit and a generated E.M.F of 50 V on open circuit. The armature resistance is 0.1 ohm. To what induced voltage should the alternator be excited if it is to deliver the load of 100 A at a pf of 0.8 lagging, with a terminal voltage of 200 V.

3) Describe the effect of varying the excitation upon the armature current and power factor of the synchronous motor for a constant output with the help of phasor diagram.

4) a) A 500, 1 Phase synchronous motor provides a net output mechanical power of 7.46 KW and operates at the 0.9 pf lagging. Its effective resistance is 0.8 ohm. If iron and friction losses are 500 W and excitation losses are 800 W, determine the armature current. Find the commercial efficiency.

b) A 75 KW,3 phase star connected ,50 Hz , 440v cylindrical rotor synchronous motor operates at rated condition with 0.8 pf leading. The motor efficiency excluding field and stator losses, is 95% and Xs =2.5 ohm. Find:

i) Mechanical power developed

ii) Armature current

iii) Back e.m.f

iv) Power angle

v) Maximum or pull out torque of the motor.

Electrical & Electronics, Engineering

  • Category:- Electrical & Electronics
  • Reference No.:- M913269

Have any Question? 


Related Questions in Electrical & Electronics

1 what would be the voltage and current standing wave

1. What would be the voltage and current standing wave patterns for an open-circuited line? 2. Discuss the variation with frequency of the input reactance of a short-circuited line and its application in the determinatio ...

1 distinguish between centralized and decentralized p2p

1. Distinguish between centralized and decentralized P2P networks. 2. What are the advantages and disadvantages of a centralized P2P network? 3. What are the advantages and disadvantages of a decentralized P2P network? 4 ...

The performance of a journal bearing around a rotating

The performance of a journal bearing around a rotating shaft is a function of the following variables: Q, the rate of flow lubricating oil to the bearing in volume per unit time; D, the bearing diameter; N, the shaft spe ...

1 state and briefly discuss the basic definition of the

1. State and briefly discuss the basic definition of the curl of a vector. 2. What is a curl meter? How does it help visualize the behavior of the curl of a vector field? 3. Provide two examples of physical phenomena in ...

Question 1a for the circuit shown in figure 1 sketch the

Question 1. (a) For the circuit shown in FIGURE 1 sketch the voltage waveform across the secondary winding of the transformer. On the same diagram sketch the load voltage waveform. The sketches should take into account d ...

1 discuss polarization of sinusoidally time-varying fields

1. Discuss polarization of sinusoidally time-varying fields, as it is relevant to propagation of uniform plane waves. 2. Discuss the propagation of uniform plane waves arising from an infinite plane current sheet of nons ...

Kansas city is famous for its barbeque but good barbeque

Kansas City is famous for its barbeque. But, good barbeque comes at a cost: Pit masters have to bear the costs of producing slow-roasted pulled pork and beef briskets. There is also an external cost: Every time a pit mas ...

Write the expression for the vector distance of a point in

Write the expression for the vector distance of a point in a rectangular room from one corner of the room, choosing the three edges meeting at that point as the coordinate axes. Describe the vector distance field associa ...

1 what is the significance of a nonzero net right-lateral

1. What is the significance of a nonzero net right-lateral differential of and normal to the z-direction at a point in space? 2. If a pair of E and B at a point satisfies Faraday's law in differential form, does it neces ...

1 learning outcomesat the end of this project students will

1. Learning outcomes At the end of this project, students will be able to: 1) Analyze power system faults based on balance and unbalanced faults techniques. (PLO4-CTPS-C4) 2) Express power flow analysis using EMTP softwa ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro

Describe what you learned about the impact of economic

Describe what you learned about the impact of economic, social, and demographic trends affecting the US labor environmen